Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 31, 2024
Property, Plant and Equipment [Line Items]
Property and equipment	$ 231,617	$ 219,859
Accumulated depreciation	(111,624)	(109,049)
Property and equipment, net	119,993	110,810
Land
Property, Plant and Equipment [Line Items]
Property and equipment	19,342	19,562
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 117,973	111,767
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 76,226	72,161
Fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,673	2,979
Transportation equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Transportation equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 15,403	$ 13,390